Matthew 5:29-30. Why Do You Think This Is God Speaking?

As born again believers, we are called to be aware of the devil's lies and resist them. What about the devil's lies about scripture? Did God really say to cut off your right hand so you could be saved by amputation in serious self harm? Can you cut off parts of your body to avoid going to hell? Why don't we question what we are told is God speaking to us? Who put this book together and added these words?John is authentic. Why would we need more?Mat 5:29And if thy right eye shall cause thee to sin, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.Mat 5:30And if thy right hand shall cause thee to sin, cut it off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.